The 'easiest' place to get this spell is Rolanberry Fields[S] off of Scabrous Slugs, next to the two lakes in the west. I could not solo it (with NPC) @ lvl 70 due to a TP move that gives 'Encumbrance' - Removes all equipment and makes you unable to re-equip anything for a short amount of time. Couldn't re-equip by 10 seconds, had to warp out or die.